Its self-driving vehicles Google θα πρέπει φυσικά να ακολουθούν τους κανόνες οδικής κυκλοφορίας και σύμφωνα με τους κανόνες οδικής κυκλοφορίας, ένας οδηγός σταματάει άμεσα το αυτοκίνητο όταν κάποιο όχημα της polices approaches his car, and does to him signal to stop.
In addition, the police sometimes participate in some tracking operations. During these operations, any police vehicle does not follow the traffic rules, that is, it can violate traffic signals and run without any limitation of speed. 
The other cars that happen to be at the point of tracking should do aside to disturb it.
So Google developed a system detectionof police vehicles that it will adapt to its self-driving cars.
The detection system can automatically detect police vehicles from the flashing siren lights.
The police vehicles (of USA) have a lighting system with four different light sources in a horizontal configuration. The four light sources emit a specific red and blue light alternately.
As soon as Google's self-navigator detects a police vehicle, it turns right and stops. The system can also be used to detect other types of emergency vehicles, such as ambulances.
